tag:blogger.com,1999:blog-59237777487401660202011-04-21T11:22:08.286-07:00tomspnoreply@blogger.comBlogger11100tag:blogger.com,1999:blog-5923777748740166020.post-52937588302139521502008-03-12T15:46:00.000-07:002008-03-12T16:12:00.845-07:00<span style="font-family:arial;">(hosted on <a href="http://code.google.com/p/jsfatwork">http://code.google.com/p/jsfatwork</a>)<br /><br />Lately I was thinking about doing a small JSF web application for my presentation "JSF@work" at </span><a style="font-family: arial;" href="http://conference.irian.at/">JSFDays*08 in Vienna</a><span style="font-family:arial;"> hosted by IRIAN Solutions. The application should be easy to understand, small &amp; support rapid prototyping for my live presentation. I ended up using the following components:</span><br /><ul style="font-family: arial;"><li><a href="http://myfaces.apache.org/core12/index.html">MyFaces core</a> 1.2.3 - JSF implementation<br /></li><li><a href="http://myfaces.apache.org/tomahawk/index.html">MyFaces Tomahawk</a> 1.1.7 - JSF component library<br /></li><li><a href="http://myfaces.apache.org/orchestra/index.html">MyFaces Orchestra </a>1.1 - extended scopes (conversation, flash)<br /></li><li><a href="https://facelets.dev.java.net/">Facelets </a>1.14 - JSF view technology<br /></li><li><a href="http://springframework.org/">Spring </a>2.5 - IOC container<br /></li><li><a href="http://www.hibernate.org/">Hibernate </a>3.3.1.ga - <a href="http://java.sun.com/developer/technicalArticles/J2EE/jpa/">JPA </a>persistence layer<br /></li><li><a href="http://hsqldb.org/">hsqldb </a>1.8 - database<br /></li><li><a href="http://oval.sourceforge.net/">OVal </a>1.10 - object validation framework</li></ul><span style="font-family:arial;">To see the application in action:<br />a) download the source archive from <a href="http://code.google.com/p/jsfatwork/downloads/list"></a><a href="http://jsfatwork.googlecode.com/files/jsfatwork1-0.zip">http://jsfatwork.googlecode.com/files/jsfatwork1-0.zip</a><br />b) run it using maven2: mvn tomcat:run<br /><br />MyFaces, Hibernate &amp; Spring are each proved technologies working very well, but h</span><span style="font-family:arial;">ow to conflate all these libraries to a working web application? In the past questions like this caused headaches among many JSF web programmers. What's needed is a glue code that integrates the stack. That's where MyFaces Orchestra comes into play. Orchestra is a lightweight integration library that solves two of the main existing JSF issues:<br /></span><ul style="font-family: arial;"><li>missing extended scopes</li><li>missing long unit of work pattern for a better integration with JPA</li></ul><span style="font-family:arial;">Even more orchestra could be used with other Java web technologies, eg. Struts - but that's another story. Let's take a closer look at the two missing JSF concepts.<br /><br />In general it's a good practice to keep the state of your beans as long as necessary but as short as possible. Therefore a scope is needed, shorter than the http session but one that can outlast more than one request. Access/Flash or Manual/Conversation scopes last in between session and request scopes.<br /><br /><span style="font-weight: bold;">Flash scoped beans</span> are kept in memory for the subsequent request as long as they are getting referenced during the processing of one request. A <span style="font-weight: bold;">conversation scope</span> starts at certain defined entry views (pages) and has to be ended manually. Think of a wizard using several views to collect data from the user, whereas action "save to database" may be a valid exit point to invalidate the running conversation and it's state (see also Orchestra </span><a style="font-family: arial;" href="http://myfaces.apache.org/orchestra/myfaces-orchestra-core/viewController.html">ViewController</a><span style="font-family:arial;"> pattern).</span><br /><br /><br /><span style="font-family:arial;"><br /><br /></span><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/5923777748740166020-5293758830213952150?l=jsfatwork.blogspot.com' alt='' /></div>tomspnoreply@blogger.com0